Over one year, she returned 22.2% in the mixed assets - aggressive GBP sector, versus the average manager return of 19%.

An Aberdeen Asset Management spokesperson said: 'Fiona told us of her wish to pursue other interests at the end of last year. Her responsibilities have been shared across our Aberdeen Solutions and Multi-Asset teams, incorporating over 70 investment professionals.

'Heather McKay, Senior Portfolio Manager, will work alongside Mike Turner in managing the Aberdeen Multi-Asset Fund. We are immensely grateful to Fiona for her contribution over the years and wish her well for the future.'

Earlier this month Aberdeen Asset Management announced a £11 billion merger with Standard Life Investments.

A few days later it was announced that Standard Life Investments' equity boss David Cumming would be leaving the firm.

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